except mr. mandela. i find him outstanding. being terribly cool and relaxed. that's the first time i met him. again, i met mr. mandela in his office, in his law office in johannesburg in 1952 where he posed for me for a photograph in front of his desk. again, i found i had this impression of him being a very relaxed and self controlled person. >> i want to go back to the first picture we showed. i understand it is your favorite. it is of mandela in his cell on robben island in 1994. voted one of the most memorable images of the 20th century. give us insight into this moment. if you spoke with him or what he was thinking at that moment. >> it is very difficult for me to know what he was thinking. i imagine that at that time, he had spent 17 years in this cell. i asked him if he would stand against the window and look out through the bars. he did that for me. i photographed a number of pictures of him standing looking out. there was a moment of total quietness and it was a very thoughtful moment. i noticed the different frames i shot as the expressions changed f